Iso 20457 Tg5 -

Within the ISO 20457 framework, , suitable for a wide variety of plastic parts. It is often used as the default standard when no specific tolerance is called out on a technical drawing. According to industry sources, TG5 is a "medium" tolerance grade, striking a balance between dimensional accuracy and manufacturing cost. In practical terms, for mid-sized parts (100–300 mm), the typical tolerance range associated with TG5 is around ±0.10 mm to ±0.25 mm . Another source indicates that for automotive interior trim or electronic enclosures (which often use TG5), the achievable range is ±0.10mm to ±0.25mm for medium-sized parts. It's considered the standard benchmark for industrial parts, while tighter grades like TG4 represent the extreme limit of tool-room capability.

Standard precision . Used for technical parts where fit and function are critical but extreme micro-precision is not required. TG6: Coarse precision, typical for packaging materials. Iso 20457 Tg5

Stable and capable processes (CPk > 1.33) are essential for achieving TG5. Measurement conditions are critical: dimensions must be measured after conditioning (e.g., 24-48 hours at 23°C) to allow for post-mold shrinkage stabilization. The environment must be controlled (50% ±10% RH) as hygroscopic materials like Nylon change size with humidity. Within the ISO 20457 framework, , suitable for

While TG6 is cheaper, it may lead to assembly issues if the parts need to snap together or maintain a specific aesthetic gap. TG4 (Precision) TG5 (Standard) TG6 (Coarse) Common Use Small wheels, gears Housings, trim Packaging, simple caps Manufacturing Effort Cost Economical Summary of Key Benefits In practical terms, for mid-sized parts (100–300 mm),

The standard uses a hierarchy of Tolerance Groups (TGs) to categorize the level of manufacturing effort required:

The International Organization for Standardization (ISO) is an independent, non-governmental international organization that develops and publishes international standards for a wide range of products, services, and systems. These standards ensure quality, safety, efficiency, and interoperability, and they are created through a consensus process involving experts from around the world.